Process and apparatus for three-dimensional surveying
US4873449A · kind A · utility
Inventors
Key dates
| Filing date | Feb 4, 1988 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Feb 4, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to process and apparatus for three-dimensional surveying by triangulation with a laser beam source. Pursuant to known practice, a laser beam scans a scene to be surveyed, by means of controlled rotary positioning of a mirror. The reflected beam is detected by a linear array of photosensitive receptors, enabling the location of the illuminated point to be determined by triangulation. Significant to the invention is the use of a secondary light source for precision measurement of the angular location of the scanning mirror, rather than relying upon controlled positioning of the mirror, which is much less accurate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.